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Finding the Fourth Proportional to 940.87, 1,298.10 and 608.77

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Solution

The fourth proportional to 940.87, 1,298.10 and 608.77 is: 839.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.87 : 1,298.10 = 608.77 : x
  2. Step 2: Convert to fraction form
    940.87/1,298.10 = 608.77/x
  3. Step 3: Cross multiply
    940.87x = 1,298.10 × 608.77
  4. Step 4: Simplify right side
    940.87x = 790,244.34
  5. Step 5: Solve for x
    x = 790,244.34/940.87
  6. Step 6: Final answer
    x = 839.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.